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Solving viscoelastic problems with cyclic symmetry via a precise algorithm and EFGM

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Acta Mechanica Sinica 2006年第2期22卷 170-176页

作者： zhi han Haitian Yang Ling Liu State Key Lab of Structural Analysis of Industrial Equipment Department of Engineering Mechanics Dalian University of Technology Dalian 116024 China

The paper combines a self-adaptive precise algorithm in the time domain with Meshless Element Free Galerkin Method （EFGM） for solving viscoelastic problems with rotationally periodic symmetry. By expanding variables at a discretized time interval, the variations of variables can be described more precisely, and iteration is not required for non-linear cases. A space-time domain coupled problem with initial and boundary values can be converted into a series of linear recursive boundary value problems, which are solved by a group theory based on EFGM. It has been proved that the coefficient matrix of the global EFG equation for a rotationally periodic system is block-circulant so long as a kind of symmetry-adapted reference coordinate system is adopted, and then a partitioning algorithm for facilitating parallel processing was proposed via a completely orthogonal group transformation. Therefore instead of solving the original system, only a series of independent small sub-problems need to be solved, leading to computational convenience and a higher computing efficiency. Numerical examples are given to illustrate the full advantages of the proposed algorithm.

关键词： EFGM Cyclic symmetry Precise algorithm Viscoelastic problem

Tracking control of the linear differential inclusion

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第6期12卷 464-469页

作者： Jun HUANG Zheng-zhi han School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China

The tracking control of linear differential inclusion is discussed. First, the definition of uniformly ultimate boundedness for linear differential inclusion is given. Then, a feedback law is constructed by using the convex hull Lyapunov function. The sufficient condition is given to guarantee the tracking error system uniformly ultimately bounded. Finally, a numerical example is simulated to illustrate the effectiveness of this control design.

关键词： Linear differential inclusions Tracking control Convex hull Lyapunov functions Uniformly ultimate boundedness

Use of Dispersion Relations in ππ and KK^- Coupled-Channel System

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Communications in Theoretical Physics 2007年第4X期48卷 685-694页

作者： XIAO zhi-Guang ZHENG han-Qing Department of Physics Peking University Beijing 100871 China

Systematic and careful studies are made on the properties of the IJ =00 7rTr and KK^- coupled-channel system, using newly derived dispersion relations between the phase shifts and poles and cuts. The effects of nearby... 详细信息

关键词： ππ scattering

An integrated approach to modeling and adaptive control

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Frontiers of Electrical and Electronic Engineering in China 2006年第2期1卷 228-233页

作者： han zhi-gang Faculty of Electronic-Engineering Heilongjiang UniversityHarbin 150080China

In the book(Adaptive Identification,Prediction and Control-Multi Level Recursive Approach),the concept of dynamical linearization of nonlinear systems has been *** dynamical linearization is formal only,not a real *** the linearization procedure,we can find a new approach of system identification,which is on-line real-time modeling and real-time feedback control *** modeling and real-time feedback control have been integrated in the identification approach,with the parameter adaptation model being *** structure adaptation of control systems has been achieved,which avoids the complex modeling *** objective of this paper is to introduce the approach of integrated modeling and control.

关键词： Real time identification Feedback control Structure adaptive

Fusion expression of pedA gene to obtain biologically active pediocin PA-1 in Escherichia coli

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第1期12卷 65-71页

作者： Shan-na LIU Ye han zhi-jiang ZHOU School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

Two heterologous expression systems using thioredoxin (trxA) as a gene fusion part in Escherichia coli were developed to produce recombinant pediocin *** PA-1 structural gene pedA was isolated from Pediococcus acidilactici PA003 by the method of polymerase chain reaction (PCR),then cloned into vector pET32a(+),and expressed as thioredoxin-PedA fusion protein in the host strain *** BL21 (DE3).The fusion protein was in the form of inclusion body and was refolded before purification by nickel-iminodiacetic acid (Ni-IDA) agarose resin *** activity of recombinant pediocin PA-1 was analyzed after cleavage of the fusion protein by *** diffusion test revealed that 512-arbitrary unit (AU) recombinant pediocin PA-1 was obtained from 1 ml culture medium of *** (pPA003PED1) using Listeria monocytogenes as the indicator ***-PedA fusion gene was further cloned into pET20b(+).Thioredoxin-PedA fusion protein was detected in both the periplasmic and cytoplasmic *** recombinant pediocin PA-1 from the soluble fraction attained 384 AU from 1 ml culture medium of *** (pPA003PED2).Therefore,biologically active pediocin PA-1 could be obtained by these two hybrid gene expression methods.

关键词： Bacteriocin Fusion expression Inclusion body Pediocin PA-1 Thioredoxin

Experimental Study on the Hydrodynamic Performance of a Heaving Buoy Assembled on a Net Cage Platform

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Journal of Ocean University of China 2019年第5期18卷 1031-1040页

作者： SHI Hongda DONG Xiaochen FENG Liang han zhi Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China Department of Ocean Engineering College of EngineeringOcean University of ChinaQingdao 266100China Qingdao Municipal Key Laboratory of Ocean Renewable Energy Ocean University of ChinaQingdao 266100China

To take advantage of the abundance of both fishery and wave energy resources in offshore sea areas,a novel floating platform with a heaving buoy-based wave energy converter(WEC)assembled with a set of net cages is presented in this *** floating WEC system provides a power supply,while the net cages are used for *** is designed to have an independent and self-operation breeding *** experimental study is carried out to investigate the hydrodynamic performance of the device in a wave tank considering the factors of net cages,draft depth,and power take-off,and results show that these variables have significant effects on wave energy *** waves with short periods cause intense interactions that allow the device to undergo large relative *** draft depth could be determined according to wave period rather than wave *** study also explores the response amplitude operator of the device and determines its resonance *** experimental results could provide reliable information for future studies on phase differences and the design of two-body WECs.

关键词： heaving buoy floating platform hydrodynamic performance experimental study

A Domain-Guided Model for Facial Cartoonlization

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IEEE/CAA Journal of Automatica Sinica 2022年第10期9卷 1886-1888页

作者： Nan Yang Bingjie Xia zhi han Tianran Wang Shenyang Institute of Automation Chinese Academy of SciencesShenyang 110016 University of Chinese Academy of Sciences Beijing 100049China IEEE

Dear Editor,This work investigates the issue of facial cartoonlization under the condition of lacking training *** propose a domain-guided model(DGM)to realize facial cartoonlization for different kinds of *** includes two parts:1)a domain-guided model that contains four different interface networks and can embed an image from a facial domain to a cartoon domain independently;and 2)a one-to-one tutoring strategy that uses a sub-model as a teacher to train other interface networks and can yield fine-grained cartoon faces.

关键词： networks interface Domain

Robust video denoising with sparse and dense noise modelings

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Science China(Information Sciences) 2018年第1期61卷 270-272页

作者： Guiping SHEN zhi han Xi'ai CHEN Yandong TANG State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of Sciences University of Chinese Academy of Sciences

Videos can be contaminated by noise even when captured by high-quality *** video data has both spatial and temporal redundancies,low rank factorization has been ***,most denoising methods relied on a single statistical distribution to model noise,such as Gaussian distribution[1,2].Ji et al.[3]proposed a low rank matrix completion(LRMC)relying on

关键词： Robust video denoising with sparse and dense noise modelings Figure

Nonconvex plus quadratic penalized low-rank and sparse decomposition for noisy image alignment

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Science China(Information Sciences) 2016年第5期59卷 105-117页

作者： Xiai CHEN zhi han Yao WANG Yandong TANG Haibin YU State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences University of Chinese Academy of Sciences School of Mathematics and Statistics Xi'an Jiaotong University

This paper proposes a general method for dealing with the problem of recovering the low-rank structure, in which the data can be deformed by some unknown transformations and corrupted by sparse or nonsparse noises. Nonconvex penalization method is used to remedy the drawbacks of existing convex penalization method and a quadratic penalty is further used to better tackle the nonsparse noises in the *** exploits the local linear approximation(LLA) method for turning the resulting nonconvex penalization problem into a series of weighted convex penalization problems and these subproblems are efficiently solved via the augmented Lagrange multiplier(ALM). Besides comparing with the method of robust alignment by sparse and low-rank decomposition for linearly correlated images(RASL), we also propose a nonconvex penalized lowrank and sparse decomposition(NLSD) model as comparison. Numerical experiments are conducted on both controlled and uncontrolled data to demonstrate the outperformance of the proposed method over RASL and NLSD.

关键词： low-rank decomposition nonconvex relaxation quadratic penalized batch image alignment sparse or nonsparse noise